*
 * <p>Null nodes are strictly forbidden.
 *
 * <p>Because this is an abstract class, not an interface, you can't use a lambda expression to
 * implement it:
 *
 * <pre>{@code
 * // won't work
 * TreeTraverser<NodeType> traverser = node -> node.getChildNodes();
 * }</pre>
 *
 * Instead, you can pass a lambda expression to the {@code using} factory method:
 *
 * <pre>{@code

   * instead.
   *
   * <p>Unfortunately, the method reference {@code Optional::toJavaUtil} will not work, because it
   * could refer to either the static or instance version of this method. Write out the lambda
   * expression {@code o -> Optional.toJavaUtil(o)} instead.
   *
   * @since NEXT (but since 21.0 in the JRE flavor)
   */
  @SuppressWarnings({

    return reader.lines().onClose(() -> closeUnchecked(reader));
  }

  @SuppressWarnings("Java7ApiChecker")
  @IgnoreJRERequirement // helper for lines()
  /*
   * If we make these calls inline inside the lambda inside lines(), we get an Animal Sniffer error,
   * despite the @IgnoreJRERequirement annotation there. For details, see ImmutableSortedMultiset.
   */
  private static void closeUnchecked(Closeable closeable) {
    try {

   * TreeSet#TreeSet(Comparator)}, where such consistency is expected.
   *
   * <p>The returned comparator is serializable.
   *
   * <p><b>Java 8+ users:</b> Use the lambda expression {@code (a, b) -> 0} instead (in certain
   * cases you may need to cast that to {@code Comparator<YourType>}).
   *
   * @since 13.0
   */
  @GwtCompatible(serializable = true)

   * TreeSet#TreeSet(Comparator)}, where such consistency is expected.
   *
   * <p>The returned comparator is serializable.
   *
   * <p><b>Java 8+ users:</b> Use the lambda expression {@code (a, b) -> 0} instead (in certain
   * cases you may need to cast that to {@code Comparator<YourType>}).
   *
   * @since 13.0
   */
  @GwtCompatible(serializable = true)

* Add article to [External Links](https://fastapi.tiangolo.com/external-links/): [How to continuously deploy a FastAPI to AWS Lambda with AWS SAM](https://iwpnd.pw/articles/2020-01/deploy-fastapi-to-aws-lambda). PR [#901](https://github.com/tiangolo/fastapi/pull/901) by [@iwpnd](https://github.com/iwpnd).